Press fastener



V. PUC

PRESS FASTENER Filed Oct. 13. 1930 Patented Dec. 27, 1932 UNITED STATES VOJ'TECH PUG, 0F PRAGUE, CZECHOSLOVAKIA PRESS FASTENER Application filed October 13, 1930, Serial No. 488,505, and Czechoslovakia December 31, 1929.

This invention relates to the upper part of a press fastener having a spring disposed in a chamber-like cap. This chamber-like cap is formed in a known manner by a sleeve 5 drawn out of the press fastener disc, the edge of which connected to the disc projects inwardly so as to form a flange. On this flange rests the spring which is held inwards by the unsupported edge of the s eeve being beaded over. In beading over this unsupported sleeve edge, the exposed opening of the sleeve is narrowed with the result that the wall of the sleeve tapers towards the unsupported end of the sleeve. The consequence of this is that the spring lying loosely in the chamber which embraces the constricted neck of the button part is carried along by the widened part of the button, on the latter being withdrawn, being guided along the inclined wall of the sleeve so that the spring will rest more firmly against the constricted neck of the button and the iatter may not be able to be removed at all from the upper part of the press fastener.

The invention has for its object to overcome this disadvantage and consists in this, that the unsupported edge of the sleeve is notched so that the diameter of the inwardly beaded over edge of the sleeve can be reduced without the wall of the sleeve losing its perpendicular position with respect to the press fastener disc. The degree to which the constricted neck of the button part is spanned by the spring therefore remains constant, even while the button is being withdrawn from the 5 upper part.

1 is a vertical section of the sleeve of which the female part of the press-buttonfastener will be formed with the notched edge standing upright.

Fig. 2 is a vertical section of the sleeve brought into the final form of the female part shown in engagement with a male member.

From the press fastener disc 1 the spring chamber 3 is drawn, having a double-walled disc portion with an opening therein and forming the projecting edge 2 of the chamber, and the unsupported edge 7 of the chamber is notched and beaded over so as to form an enclosing wall for the spring 5. The notched edge 7 can be beaded over inwards without altering the perpendicular position of the spring chamber wall 3 with respect to the press fastener disc 1. Hence, when withdrawing the stud part, the spring 5, which n is free to move axially and radially, will move while retaining its play till it reaches the beaded over edge, Will find an abutment against the edge and allow the button part to pass through.

In the base plate 1 are openings 4 for attaching the socket in the well known manner to the material 8. The stud 6, as shown in Fig. 2, is fixed to the material 9 in a similar manner.

What I claim is A press-button-fastener comprising the combination with a stud having a head and a constricted neck portion, of a socket having a double-walled disc portion with an opening therein, a portion extending perpendicularly from said disc portion, and in one piece with the latter and forming a chamber, a spring for engaging the stud, loosely disposed in said chamber, so as to be capable of radial movew ment therein, said perpendicularly extending portion of the socket having a plurality 'of notches in the unsupported edge remote from the disc portion with the notched edge bent over inwards so as to form an enclosing wall for said spring with an opening therein for the insertion of the head opposite the opening in the disc portion, said enclosing wall being so spaced from the disc portion as to allow of substantial free displacement of the spring in the axial direction.

In testimony whereof I have signed my name to this specification.

VOJTECH PUG. 

